Electromagnetic device.



W. W. D1 N.

ELECTROMAGNETIC DEVICE.

APPLICATION FILED JUNE 15, 1903.

1,088,771, Patented Mar.3,1914.

midtown timr o PAT Ni onFIoE.

liVllLLHilll JV. BEAN, CHICAGO, ILLINOIS, .ASSIGNOR TO KELLOGPG SWITCHBOARD & SUFPLY COIVHANY. OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

ELECTROMAGNETIC DEVICE.

Specification of Letters Yatcnt.

Patented Mar. 3, 1914.

Serial No. 161,528.

Application filed June 15, 1903.

To all whom it mug; concern Bo it known that if, WIUJAM WV. Dom, a citizen oi? the United Stores oi iuncrico, and residing ill. Chicago, in the county oi Cook and Stan: of Illinois, hove invontcd a now and u: iul improvement in Elcctrolnngnctic Dori no, of which tho following is u specifiotion.

My invention rolutcn purtiouhnly to clocirounngneiio bolls of tho tuned rocd typo, ol-

though nmny of its features are of more gencrzrl application. By tuned reed I mean a rocd or o boll adapted to respond to one (llS- ilnct prcdctcrmincd rate or frequency only, and imrcs mnsi c to all other rates of vibrnlion or ircqucncics of curro'nt.

in carrying out my invention,v which has boon worluid out for commercial purposes, 1' provide u suitable framework upon which is mounted :1 pair of inugnct spools and a tuned rcod placed bctwoon the poles oi the magnet coils and mrryiup; the armature by means of which tho sold rocd is vibrated and the bell hammer which strikes tho gong of the boll in thovibrntion oi the roocl. This road is prob crobly n'iodo rczzld lly removable and replace- :iblo so thol; it only bc handily changed for huring u ditl'ercnt characteriii. rm rules of vibration of rc ntuit readily odiustod by vary -s of the balls or hammers curricigl wluarcby no mljustmcnt in tho c it i is ,ncccssur but only that a corryng the proper sized hammer or o cinployod. The diilionltics oi inunuu. nro thus largely reduced and no lod labor is noccssory for adjusting the p illl. .1

in my inrcntioii I prefer also to usc 2i d0 oiicglo gong which in itself reduces the cost of tho dcvice and groutl'y simplifies it, although two gongs may be used if desired, without departing from my invention. I hora"dlscovcrcd also ihnt the rate of vi ill "Mimi ill. opcrution of the boll to cause it. to 1 1 to r.- dciinito rut-c of alternation l oporoti g mic of vibration oi the take place. In other words, the naturalvibrnlion of the road in that event, is accelerated by the vibration of the gong or its elasticity or both, so that it is insufficient to Incl-ply" select reeds having the proper charactoristic vibration but it is also necessary to take into account the resultant action of the reed and gong. Ilerctofore in some tuned rccd clectro-ma netic devices the armature was not rcquircd to do additional work aside from making andv breaking clectric contacts which did not. increase or decrease to any appreciable oxtcnt the vibration of the reed. In my apparatus the road is required to do work which in this instance consists in ringing the. bell so that a different problem is involvcd from that of said prior devices, and which is solved in the manner indicated. I also polurizc the boll, whereby it is particularly adopted, for operation by alternating 70.

currents of the proper frequency.

Othor features of novelty will appear from the detailed description and claims.

The arc-.companying drawing illustrates one form of the invention, the some reference characters being used throughout the several views, in Which- Figure 1. indicntcs a side elevation thereof; Fig. 2 is a side elevation at right anglcs to that of Fig. 1. Fig. 3 is a plan view of the gong mounting. lg. 4 is a segregated view in perspective of the parts of one of the rocds shown in Fig. 5. Fig. 5 is a View showing reeds for four different character-' islxic vibrations of the bell, and Fig. 6 shows the rear supporting plate of the magnet Upon a supporting shelf 2 which may be of shoot iron or other desired material and scoured laterally to the face of a support 2" mg 3 is mounted upon a central stem 4; ing through a slot 5 in said shelf and po ,currlcd by the arm (3 pivoted at one end 7 to the uppcr-sidc of said shell arid having at its opposite end .1 slot 8 through which passes a suitable bolt 9 by means of which the said 95, urn: and the gong carried thereby may-bah oriljusicd in position with reference t0"the shelf To the upper side-of said supporting shelf 2 the framework of the actuotil pan; of the boil is inclined, acid jmmowor ion comprising a front plate preferably of brass having); the le 11 provided with the feet 12 secured v suitable screws, bolts or rivets 13 to the said shelf 2. The magnet coils l-l are; mounted upon suitable cores 15 having reduced ends passing through apertures in said plate 10 and carrying the pole pieces 16 which a re adjustable toward each othe b means of the slots 'lT through which the said ends at" the cores 12.- pass, locknuts 18 being); tlirezuled upon the said ends of the cores to clamp Lli l pole pieces. the front plate 10 and. the cane: I?) together. buitable steady pins lit are provided in the front face et'said ilatc H) to maintain the pole pieces 16 in alineincnt. The rear ends of the cores are secured to the rear supporting plate 20 M' magnetic material as by the screws 21". said rear 1* are being supported by the shelf 2 by nice at the posts Ql on said shelf and rLUUL'Ql'i thereto and to the plate '20 in an desired manner. permanent uiaonct secured it its rear end to the plate suitable tlilllil7l1l strap Q 'l and exlcnds llel with the magnet coils ll to the tr-1 :crcoi'. 'lhe terminals l i .111 b tugrht out in the rear he reed oi the hell which con reed is hes shown no plate or clip I provided with ti laterally extending lugs 26 is riveted toone end ol: the leaf spring 27.

P1,. ill AUQ.

The armature pieces i3 stamped front sheet metal are seem-ed preferably by riveting to the lower end otsprinpfl? and a sprint; strip 2f) is secured in a lll1llill' manner between the lower ends of the-armature pieces 28. it the free end of the strip 2.). the ball or hammer 30 consisting of two halves is riveted thereto. The assembled recdwhich forms unit is then secured to the upper end of the front plate 10 of the hell by means of screws 31 passing through suitable apertures in the laterally extending lugs 26 and threading into the said plate 10. The mounting clip 25 preferably consists of a punching and the wings serve to concentrate the lines of force from the permanent magnet.

in order to vary the rate of vibration of the reed, find it convenient to use different. sized balls or hammers 30. this being indirated in Fig. The reeds are thus con structcd in units and the rate of operation of the hell may therefore be varied by simply using one reed or another according to the desired rate of vibration of the armature.

is stated at the beginning of this specific tion, the characteristic vibration of the reeds does not correspond to the rate of vibration of the device as a whole. The natural action of the reed is modified by the ball 30 in first instance and by the striking of the gong which serves to accelerate the The perniiinent magnet serves its usual function in polarizing the armature to permit th: device to work satisfactorily with alternating currents. 'lhat'is, by combining the polarized armature with tuned reeds provided with tappers that will partake of the v ame vibrations as the reed, I am enabled to entirely overcome the difficulties which have hitherto prevented the successful operation of tuned reeds. These diiiiculties I attribute to the fact that the tapper, while given animpulse toward the bell, Wasallowed to return according to its own free rate as influenced by the impact of the haminer against the bell. thus it the reed Was made sufliciently rigid as to require several electrical impulses before the tapper came in contact with the bell, the frequency was so disturbed by the impact with the hell that an irregular or otherwise unsatisfactory vibra- 'tion occurred after the rapper came in corn tact "with the bell. The permanent magnet by polarizing the armature renders it sensitire to impulses in both directions which serves to maintain the vibrations of tilt paz at a rate which will respond to the. particular alternations or pulsations of our rent in a regular and harmonious manner even alter the bell has been struck. ll believe that I am the first to provide such a device with a. permanent magnet for governing or regulating the movement of the armature at. all times, and thus rendering the armature sensitive to current impulses in tivo directions. sary to show an operating circuit since this matter ivell understood by those skilled in the art. I

shelf 2 to be readily secured to any vertical supporting surlace. The armature plates 28 extend for some distance below the pole pieces 16 to stiifen the reed and prevent it lrom Ylbl'tltlng in nodes or beats as is liable vibrates accurately with the reed and there.

is no tendency for the reed to vibrate and the I have not deemed it neces:

The rear edge of the supporting" shelf '2 is shown turned up to permit hammer to standstill, or for the hammerto vibrate at ddifierentrate from the reed. Also'from a manufacturers and users point of view it is preferable to make the armab ture strips 28 as described since it is much cheaper to make the two pieces and, 'rivet them in place than to use but a single piece Again by.

it errors of manufacture are not multiplied and all parts go together practically without adjustment or excessive fineness in manufac- Jture. Neither the armature nor any of the other parts are carried by the permanent 2Q 'ma-gnet as is common in his form of elec- 1.,trical devicesl' The permanent magnet is seeured in place by means of the clamping strap which saves drilling the hard steel bar for screw holes. The shelf 2 supports all 26 parts which is important with devices Imade in several parts which must work together, like the bell and gong. ,I claim T1. In a device of the class described, the 80 combination with a diamagnetic front plate, of magnet coils secured to said front plate, a supporting member to which said plate is secured to support the front ends of the mag: nets with reference to the said member, and

a vibrating reed adapted to be operated by Said magnets and fixed at one end to said front plate, substantially as described.

2. In a device of the class described, the combination with an operating magnet, of a. '10 tuned-reed adapted to be "vibrated thereby, said tuned-reed comprising a leaf spring fixed at one end, a pair of. rigid magnetic strips riveted to the opposite sides of the free end of said spring, a flexible member riveted between the other ends of said strips and a ball carried by the latter member, said strips forming the armature of the magnet, substantially as described. 3. In a device of the class described, the 0') combination with an operating magnet, of a tuned reed adapted to he vibrated thereby, said tuned reed comprising a leaf spring fixed at one end, a pair of magnetic pieces,

riveted to the opposite sides of the free end of said spring, an extending member secured between another. portion of said magnetic pieces, and a hammer carried by the latter member, said magnetic pieces forming the armature for the magnet, substantially as 6 described.

at. In a magnetic device v0t the class described, the combination with a single pair of magnet coils, of a two-piece polarized armature for' said coils, a thin spring plate fixed at one end, and secured between said bro-magnets in series, said tuned reed com- 7 armature pieces at the other end, and adapted to form a portion of the magnetic circuit of said device, and a h nnmer carrie also secured between said armature pieces, substnn tially as described.

5. In a signaling device, the combination with a pair of electro-magnets. of n tuned reed adapted to be vibrated by alternating current passed through the coils of said elecprislng a spring, a pair of armature pieces, a hammer and a supporting strip passing be tween said arn'iature pieces and supporting the said hammer, substantially as described.

6. In a device of the class described, the combination with a bell structure, including an aerating magnet, a single tuned reed rigidly supported at one end and having its central portion adapted to not 1.5 the armature of said magnet, said tuned reed also ineluding a hammer or ball, 1-. gong adapted to be struck by the hammer or ball oi said tuned reed, the characteristic rate of the ac tualion of the bell being varied by the size of the hammer or ball carried by [be tuned reed, and means for readily substitulinga tuned reed having: a hammer or ball of the desired size, substantially as described.

7. In a device of the class described the combination of a supper-lin shelf having an aperture and constructed and nda ited to be secured horizontally to a wall or the like, a single bell gone adjnstably secured to the under side of said shell. :1 vertical plate so cured to the upper side of said shelf, a pair of clectro-magncls secured to said plate. on one side thereof, an armature for said 1nagnets, pole-pieces for said magnets adj ustably secured to the other side of said plate, and a tuned reed secured to said plate, carrying said nrmaturcs and passing between said pole-pieces and through the aperture in said shell and including, a. ball or han'nncr carried in position to strike said gong.

8. In a signaling device, the combination with a pair of magnet spools, of a magnetic support connecting said spools at one end, a non-magnetic member secured to the other ends of said spools, a tuned reed supported by said member, including an armas ture and bell tappcr, a permanent magnet secured at one end to said magnetic support and having, its other end in proximity witlr said armature, whereby the armature is I)() larizcd, said armature and bell-topper being adapted to be vibrated by the current in said' magnet spools, substantially as described.

9. In a sigpmling device, the eomlnnation with a pair of magnet spools. of a magnetic support connecting; said spools at one end, a non-magnetic membersecured to the other ends of said sppols, a tuned reed supported by said member, comprising a short still spring, an armature,al ell topper, and a resilient mounting carried by the armature for said tapper, a permanent magnet secured at Signed by me at Chicago, county of Cook, one end to said magnetic support and having State of Illinois, this 12th day of June, 1903. its other end in proximity with said armature,-Whereby the arma'tureis polarized, said WILLIAM DEAN armature and bell-tappef being adapted to Witnesses: v

be vibrated by thecm'rent in said magnet EVA A. GARLOCK,

spools, substantially as described. i ROBERT LEWIS AMEs. 

